I didn't see Graham Norton but I saw the two of them being interviewed on an iPlayer movie thingy and I did think they were unusually familiar but then pulling away. On the other hand luvvies are often quite touchy-feely and they've probably spent hours together on set so would be quite comfortable with each other.

I didn't know of the split and just watched some of Graham Norton thinking "if I was his wife I'd be weirded out by that interview" Too much fun they said about their promo tour. Poor old Jack trying to join in.